[Boost-bugs] [Boost C++ Libraries] #9506: @#ifndef - what's it doing in Boost sources?

Subject: [Boost-bugs] [Boost C++ Libraries] #9506: @#ifndef - what's it doing in Boost sources?
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2013-12-18 08:43:53

#9506: @#ifndef - what's it doing in Boost sources?
------------------------------+-------------------------
 Reporter:  walter@…          |      Owner:  johnmaddock
     Type:  Bugs              |     Status:  new
Milestone:  To Be Determined  |  Component:  type_traits
  Version:  Boost 1.54.0      |   Severity:  Problem
 Keywords:                    |
------------------------------+-------------------------
 Looking at the boost file:

 http://www.boost.org/doc/libs/1_55_0b1/boost/type_traits/detail/is_mem_fun_pointer_impl.hpp


 towards the end, there are these lines:

 @#ifndef BOOST_TT_NO_ELLIPSIS_IN_FUNC_TESTING
 template <class R BOOST_PP_COMMA_IF(BOOST_PP_COUNTER)  [...]
 struct is_function_ptr_helper<R (*)(BOOST_PP_ENUM_PARA [...]
 @#endif

 What are the @ characters doing there? I can't find any reference to @
 being an allowable character (at least in the C++98 Standard).

 The @ characters also appear in is_function_ptr_helper.hpp

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/9506>
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